Internal combustion engine



FIG. 1 is a rear, right side perspective view of an internal combustion engine in accordance with our new design;

FIG. 2 is a front, left side perspective of the internal combustion engine of FIG. 1;

FIG. 3 is a rear, left side perspective view of the internal combustion engine of FIG. 1;

FIG. 4 is a front elevational view of the internal combustion engine of FIG. 1;

FIG. 5 is a right side elevational view of the internal combustion engine of FIG. 1;

FIG. 6 is a top view of the internal combustion engine of FIG. 1;

FIG. 7 is a left side elevational view of the internal combustion engine of FIG. 1;

FIG. 8 is a rear elevational view of the internal combustion engine of FIG. 1; and,

FIG. 9 is a cross-sectional view of the internal combustion engine of FIG. 4 taken along the line B-B of FIG. 4.

The broken lines in the figures are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for an internal combustion engine, as shown and described. 